S6B33A2 Datasheet, PDF (19/67 Pages) Samsung semiconductor – 128 RGB Segment & 129 Common Driver For 4,096 Color STN LCD

S6B33A2 PRELIMINARY VER 1.3 128 RGB SEGMENT & 129 COMMON DRIVER FOR 4,096 COLOR STN LCD
Table 12. Microprocessor Selection for Serial Interface
PS
MPU[1]
/CS1
CS2
D/I
L
/CS1
CS2
D/I
L
H
/CS1
CS2
S/W
Serial Data Serial Clock
DB[7]
DB[6]
SPI Mode
3-Pin
4-Pin
3-Pin SPI Interface (PS = “L” & MPU[1] = “L”)
In 3-Pin SPI Interface mode, the pre-defined instruction called Display Data Length is used to indicate whether serial
data input is display or instruction data instead of D/I pin. The data is handled as instruction data until the Display
Data Length instruction is issued. This Display Data Length instruction consists of three bytes instruction. The first
byte instruction enables the next two instructions to be valid, and the data of the next two bytes indicate that a
specified number of display data bytes(1 to 65536) are to be transmitted. For details, refer the Figure 8.
Chip Select
SCL(DB6)
SDI(DB7)
Internal D/I
/CS1 = L, CS2 = H
12
23 24 1 2
79 80
2 bytes
11111100 00000000 00001001
DDL_SET
DDL_H = 0 DDL_L = 9
(Initial : 80h,00h)
= 32,768
9 bytes
9 bytes display data
User's display data (Initial 50688 bytes)
Figure 10. 3-Pin SPI Timing (D/I is not used)
4-Pin Serial Interface (PS=”L” & MPU[1]=”H”)
In 4-pin SPI interface mode, D/I pin is used for indicating whether serial data input is display or instruction data.
Data is display data when D/I is high and instruction data when D/I is low.
Serial data can be read on the rising edge of serial clock going into DB6 and processed as 8-bit parallel data on the
eighth serial clock.
Chip S_lelect
SID (DB7)
SCL(DB6)
D/I
/CS1=L, CS2=H
DB7
DB6 DB5
DB4 DB3
DB2 _DB1
DB0 DB7
DB7
Figure 11. 4-Pin Serial Interface Timing
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